A dicationic ionic liquid-modified phosphotungstate hybrid catalyst for the heterogeneous oxidation of alcohols with H_2O_2  

作　　者：LENG Yan ZHAO PingPing ZHANG MingJue CHEN GuoJian WANG Jun 

机构地区：[1]State Key Laboratory of Materials-Oriented Chemical Engineering,College of Chemistry and Chemical Engineering,Nanjing University of Technology,Nanjing 210009,China

出　　处：《Science China Chemistry》2012年第9期1796-1801,共6页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China (21136005)

摘　　要：An ionic hybrid catalyst 1,1＇-（butane- 1,4-diyl）-bis（3-methylimidazolium） phosphotungstate （abbreviated [Dmimh.sPW） has been prepared by anion-exchange of the divalent ionic liquid （1L） 1,1 ＇-（butane-1,4-diyl）-bis（3-methylimidazolium） di（bromide） with the Keggin phosphotungstic acid H3PW12O40, and characterized by IR, 1H NMR, 13C NMR, ESI-MS, TG, SEM, XRD, BET surface area measurements, elemental analysis, and melting point. The hybrid material was evaluated as a catalyst for the oxidation of alcohols with aqueous hydrogen peroxide under various conditions. The catalytic performance of [Dmim]t.sPW was also compared with related catalysts bearing other cations or anions. The new hybrid [Dmim]1.5PW proved to be an effi- cient liquid-solid heterogeneous catalyst for H2O2-based oxidation of alcohols, with the advantages of high conversion and se- lectivity, easy recovery, and quite good reusability.An ionic hybrid catalyst 1,1'-(butane-1,4-diyl)-bis(3-methylimidazolium) phosphotungstate(abbreviated [Dmim] 1.5 PW) has been prepared by anion-exchange of the divalent ionic liquid(IL) 1,1'-(butane-1,4-diyl)-bis(3-methylimidazolium) di(bromide) with the Keggin phosphotungstic acid H 3 PW 12 O 40,and characterized by IR,1 H NMR,13 C NMR,ESI-MS,TG,SEM,XRD,BET surface area measurements,elemental analysis,and melting point.The hybrid material was evaluated as a catalyst for the oxidation of alcohols with aqueous hydrogen peroxide under various conditions.The catalytic performance of [Dmim] 1.5 PW was also compared with related catalysts bearing other cations or anions.The new hybrid [Dmim] 1.5 PW proved to be an efficient liquid-solid heterogeneous catalyst for H2O2-based oxidation of alcohols,with the advantages of high conversion and selectivity,easy recovery,and quite good reusability.

关 键 词：hybrid catalyst HETEROPOLYACID ionic liquid oxidation of alcohols heterogeneous catalysis 

分 类 号：O643.32[理学—物理化学]